Fix compatibility issue between older clients and newer workers on DT…

….AzureStorage (Azure#651)

fixed DeleteAllDataForOrchestrationInstance method to return rowsDele…

…ted (Azure#635)

Faster StructuredLogEvent (Azure#631)

Faster StructuredLogEvent (Azure#631)

Incremented AzureStorage to 1.9.3 (Azure#612)

Update DurableTask.props to work with different sln file locations (A…

…zure#608)

Also updated DT.AzureStorage build number to 1.9.2

Set up build signing pipeline with Azure Pipelines (Azure#606)

Also:
* Created solution just for building DurableTask.AzureStorage and DurableTask.Core
* Removed legacy static analysis, which was only working for net461 anyways
* Updated some test projects from .net core 2.1 (out of support) to .net core 3.1

Fixed NullRef when querying instance status on execution started (Azu…

…re#587)

Prepare DurableTask.Core and DurableTask.AzureStorage release (Azure#582

)

The previous fix Azure#560 was not actually released as the fix is contained
in DurableTask.Core, which was not released as a part of
DurableTask.AzureStorage v1.8.8.

The fix in Azure#560 is more severe than we thought as it makes a
TaskHubWorker lose an entire partition when it completes an
orchestration, so we are also releasing a new version of
DurableTask.AzureStorage that depends on DurableTask.Core having this
fix.

Prepare DurableTask.Core and DurableTask.AzureStorage release (Azure#582

)

The previous fix Azure#560 was not actually released as the fix is contained
in DurableTask.Core, which was not released as a part of
DurableTask.AzureStorage v1.8.8.

The fix in Azure#560 is more severe than we thought as it makes a
TaskHubWorker lose an entire partition when it completes an
orchestration, so we are also releasing a new version of
DurableTask.AzureStorage that depends on DurableTask.Core having this
fix.